31221000222 has 16 divisors (see below), whose sum is σ = 65728421760. Its totient is φ = 9859263192.

The previous prime is 31221000211. The next prime is 31221000233. The reversal of 31221000222 is 22200012213.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31221000211) and next prime (31221000233).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136934098 + ... + 136934325.

It is an arithmetic number, because the mean of its divisors is an integer number (4108026360).

Almost surely, 2^31221000222 is an apocalyptic number.

31221000222 is an abundant number, since it is smaller than the sum of its proper divisors (34507421538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221000222 is a wasteful number, since it uses less digits than its factorization.

31221000222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273868447.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 31221000222 its reverse (22200012213), we get a palindrome (53421012435).

The spelling of 31221000222 in words is "thirty-one billion, two hundred twenty-one million, two hundred twenty-two", and thus it is an aban number.